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<head>
  <meta charset="UTF-8">
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  <title>Document</title>
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<body>
  <script>
    //父类 基类
    function Person(name, age) {
      this.name = name;
      this.age = age;
    }
    Person.prototype.eat = function () {
      console.log("eat")
    }

    //子类
    function Student(id, name, age) {
      //构造函数继承
      Person.call(this, name, age);
      this.id = id;
    }

    //原型链继承(不能直接把父类的原型对象赋值给子类的原型对象,否则会共享)
    Student.prototype = new Person;
    //修正constructor
    Student.prototype.constructor = Student;

    Student.prototype.study = function () {
      console.log("node")
    }
  </script>
</body>

</html>